贝塞尔光束作用下介质微球的空间Fano共振
Spatial Fano resonance of a dielectric microsphere impinged by a Bessel beam
摘要：
考虑了Fano共振的一般概念，从而说明了这种空间共振的可能性。使用最近发现的解决方案的贝塞尔光束撞击介质球，我们分析了电磁场附近的微球具有不同的光学尺寸和介电常数值。我们从理论上揭示了空间Fano共振时的谐振模式的球干涉{量}非共振模式。这种共振导致一阶贝塞尔光束撞击球后的电场的巨大跳跃。电磁场的局部最小值明显远离微球的后边缘。然而，这是一个近场效应，我们证明了这一点。我们还表明，这种效果可以利用工程的亚微米光学陷阱与不寻常的和有用的属性。
英文摘要：
General concept of Fano resonance is considered so that to show the possibility of this resonance in space. Using a recently found solution for a Bessel wave beam impinging a dielectric sphere, we analyze the electromagnetic fields near a microsphere with different optical size and permittivity values. We theoretically reveal a spatial Fano resonance when a resonant mode of the sphere interferes with {an amount of } non-resonant modes. This resonance results in a giant jump of the electric field behind the sphere impinged by the first-order Bessel beam. The local minimum of the electromagnetic field turns out to be noticeably distanced from the rear edge of the microsphere. However, this is a near-field effect and we prove it. We also show that this effect can be utilized for engineering a submicron optical trap with unusual and useful properties.
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